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ESPN.com Illustration

Introduction

Heisman Trophy winners. All-Americans. Hall of Famers. Collectively, they were some of the greatest players in college football history. During their careers, they led their teams to titles, and had nicknames like "Mr. Inside," "Rocket" and the "Boz." They were the real big men on campus.

But once the marching bands and pep rallies stopped, they barely made a ripple in pro football. Because of injuries, military commitments and other career decisions, many of the sport's legends never made an impact in the NFL.

Once the head of the class in college football, they can simply be known for what they did on Saturdays. -- Mark Schlabach